abstract:The Changdao County () is a county in Yantai, Shandong, China. It consists of a chain of islands, Changshan Islands (长山列岛), in the Bohai Sea, north of Penglai, Shandong Province.
At the same time, the peak values of monthly frequency ofsmallearthquake swarmsinLinxianCounty, Taiyuan and the Changdaoareaalmostsynchronouslyoccurred.